Modulation type of digital signal in analog transmission

In analog transmission of digital signals, there are several modulation types:

Amplitude Shift Keying (ASK)

  • In ASK, the amplitude of the carrier signal is varied according to the digital information being transmitted. For example, a high amplitude might represent a binary '1' and a low amplitude might represent a binary '0'.
  • ASK is relatively simple to implement but is susceptible to noise and attenuation.

Frequency Shift Keying (FSK)

  • FSK changes the frequency of the carrier signal to represent different digital values. For instance, one frequency might indicate a '1' and another frequency might indicate a '0'.
  • It is more resistant to noise than ASK and is commonly used in applications such as radio frequency communication.

Phase Shift Keying (PSK)

  • PSK modifies the phase of the carrier signal. Different phases can represent different binary values. For example, 0 degrees phase might be a '0' and 180 degrees phase might be a '1'.
  • PSK can provide more efficient transmission and is used in various digital communication systems.

These modulation techniques allow digital signals to be transmitted over analog channels, enabling a wide range of applications in telecommunications, data communication, and wireless systems.